I hope it's fairly obvious, but several of the products and services I mention and review on Cyclelicious I've received either free or at a discount. I make it clear that there's no guarantee of a favorable mention when I'm given things to review, and my general policy has been to highlight the superlatives on truly good products, to give just the facts on mediocre things, and to blatantly ignore the truly bad things I've gotten. If I don't think I'll can give a good review I'll decline the product.
The Taiwan Bike Trip, for example, was almost entirely free. Air travel was courtesy of China Airlines. The entire tour package -- including hotel stay, travel on Taiwan, bike rental, museum and park entrance fees, and most meals -- was arranged by the Taiwan Tourism Bureau and Giant Bicycles. They're working to promote bike tourism in Taiwan for both domestic and international travelers, and I have to say they've done a marvelous job. I'd visit Taiwan for a vacation again in a heartbeat, and the cost of the tour package (under $2,000) seems fairly reasonable to me.